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Giardia is one of the most common intestinal parasites worldwide, and infects up to 20% of the world population, mostly in poorer countries with inadequate sanitation. Infections are most common in children, though chronic Giardia is more common in adults.
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The familiar sounds of your heart are made by the heart's valves as they open and close.
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There are 60,000 miles of blood vessels in every adult human.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.